krisschils1256 :
is that motherboard compatiable with this ram
Yes, the memory is compatible. When you say that the new RAM didn't show up - is it in the BIOS or in windows properties? If the memory was defective then it would never have booted in the first place.
Try this:
This problem may occur because the Maximum memory option is selected incorrectly. To fix this, follow these steps:
Click Start, type msconfig in the Search programs and files box, and then click msconfig in the Programs list.
In the System Configuration window, click Advanced options on the Boot tab.
Click to clear the Maximum memory check box, and then click OK.
Restart the computer.
Or do a BIOS update:
http://www.gigabyte.us/products/product-page.aspx?pid=3487#bios (Click on the link to download the latest version "F12E")
Follow the instructions mentioned in the manual to install the BIOS.
Enable the memory remapping feature:
Check the BIOS settings to see whether the memory remapping feature is enabled. Memory remapping gives Windows access to more memory. You can enable the memory remapping feature in the BIOS by booting to the system setup. See the User's Guide for your computer for instructions on how to boot to system setup on your computer. The name for the memory remapping feature may be different for different hardware vendors. This can be listed as memory remapping, memory extension, or something similar. Be aware that your computer may not support the memory remapping feature.
Also make sure you have installed the memory in the right way (Correct population method).
Check this article:
http://support.microsoft.com/kb/978610
Good luck!!